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Question

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0×107m2, and its resistance is measured to be 5.0Ω. What is the resistivity of the material at the temperature of the experiment?

Solution
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Let resistivity coefficient be ρ
R=ρlA
ρ=RAl
ρ=2×107Ωm

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